For decades, scientists believed dinosaurs were diurnal and tiny mammals were nocturnal. But as researchers have uncovered more mammalian fossils and studied the biology of different dinosaur species, they’ve found some surprising results.

Thanks to Ceri Thomas (  / alphynix  , Julio Lacerda (  / juliotheartist  , and Nobu Tamura (http://spinops.blogspot.com/) for their excellent reconstructions featured in this video.

Produced by Complexly for PBS Digital Studios

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References: https://docs.google.com/document/d/1d...